Kayle's Abilities

Quick Comment

Life Steal applies with on hit aspect
Item passives take into account AoE aspect
Makes Kayle "ranged" instead of "melee" for the duration

Ravenous Hydra does not work during it, Runaan's Hurricane works. Both spellvamp and lifesteal apply. It is considered BA though the activation is considered spell cast. Damage benefits from both AP and AD. Both pens apply.

I think it should be reworded "the splash damage doesn't affect turrets and cannot splash off turrets". Personal opinion.

Now it splashes off turrets, making you damaging turret from safe distance while killing nearby minions. But your main target must be turret... So when you target minions the turret will take no damage but when you target turret minions would die.